TY - JOUR
T1 - Reaction behavior of stratified SiO2 granules during electrochemical reduction in molten CaCl2
AU - Yang, Xiao
AU - Yasuda, Kouji
AU - Nohira, Toshiyuki
AU - Hagiwara, Rika
AU - Homma, Takayuki
N1 - Funding Information:
This study was partly supported by JST-CREST and Grants-in-Aid for Scientific Research A from the Japan Society for the Promotion of Science (JSPS). The authors thank Taiheiyo Cement Corporation for providing high-purity SiO2 granules.
PY - 2014/8
Y1 - 2014/8
N2 - The electrochemical reduction behavior of stratified SiO2 granules in molten CaCl2 at 1123 K (850 °C) was investigated to develop a new process for producing solar-grade silicon. The cross sections of the electrolyzed electrode prepared from a graphite crucible filled with SiO2 granules were observed and analyzed. The visual and SEM observations indicate that the overall reduction proceeds via two different routes. In one route, the reduction proceeds along the granule surfaces from the SiO2 near the conductor to the distant SiO2. In the other route, the reduction proceeds from the granule surface to the core of each granule. The reduction along the granule surfaces is faster than that from the surface to the core. Fine SiO2 granules are expected to be favorable for a high reduction rate.
AB - The electrochemical reduction behavior of stratified SiO2 granules in molten CaCl2 at 1123 K (850 °C) was investigated to develop a new process for producing solar-grade silicon. The cross sections of the electrolyzed electrode prepared from a graphite crucible filled with SiO2 granules were observed and analyzed. The visual and SEM observations indicate that the overall reduction proceeds via two different routes. In one route, the reduction proceeds along the granule surfaces from the SiO2 near the conductor to the distant SiO2. In the other route, the reduction proceeds from the granule surface to the core of each granule. The reduction along the granule surfaces is faster than that from the surface to the core. Fine SiO2 granules are expected to be favorable for a high reduction rate.
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U2 - 10.1007/s11663-014-0056-5
DO - 10.1007/s11663-014-0056-5
M3 - Article
AN - SCOPUS:84906320989
SN - 1073-5615
VL - 45
SP - 1337
EP - 1344
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 4
ER -